/*
* @Author: shu
* @Date:   2018-08-09 16:18:32
* @Last Modified by:   shu
* @Last Modified time: 2018-08-09 16:57:30
*/
.a1{
	float: none;
	margin-left: auto;
	margin-right: auto;
	display: block;
	margin-top: 100px;
}